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Magnetism • How do magnets interact with each other? Key Question • If a material is magnetic, it has the ability to exert forces on magnets or other magnetic materials. • A permanent magnet is a material that keeps its magnetic properties even when it is NOT close to other magnets. What is a magnet? • Magnets have two opposite poles. • North • south • Magnets exert forces on each other. • The forces depend on the alignment of the poles. Properties of Magnets • Magnets must have a north pole and a south pole • If you cut a magnet in half, the resulting pieces have a north and south pole each • There is no such thing as a magnetic ‘monopole’ Properties of Magnets • All magnets create a magnetic field in the space around them, and the magnetic field creates forces on other magnets. • Magnetic field lines always point away from a magnet’s north pole and toward its south pole. • The closer the lines are together, the stronger the field. • The number of field lines in a certain area indicates the relative strength of the magnetic field in that area. Magnetic Field • Whenever there is a moving electric charge, there is a magnetic field and an electric field • Bring a compass near a current carrying wire and you will see the compass deflect • Once the electric charge stops moving, the magnetic field dissapates Magnetism and Electricity • Permanent magnets can induce magnetic properties in certain materials. • The furthermost point must have the opposite pole of the opposite side • Remember, no magnetic monopoles Magnetic Induction Magnets, How do they work?